DEVELOPMENT OF DC TRANSFORMER AND FAULT CURRENT LIMITER FOR HIGH-POWER DC NEWTORKS

Lead Research Organisation: University of Aberdeen
Department Name: Engineering

Abstract

This project studies development of high power DC transmission networks. There is currently significant interest in developing technologies that will enable interconnection of distributed DC sources to DC networks in multi MW power sizes. The application fields include offshore renewable power parks, North Sea Supergrid, subsea power supplies in oil industry and many more. A medium power DC network test rig will be developed at Aberdeen University which will include DC transformers and fault isolation components. The project will investigate efficient, light-weight DC transformer topologies that will enable cost-effective power exchange between DC systems at wide varying voltage levels. The DC test rig will enable practical testing of DC circuit breaker which will be one of the crucial enabling technologies for DC networks. The project further investigates the operational and control principles of future large DC power networks. This project strengthens collaborative links between University of Aberdeen and Ryerson University LEDAR laboratory.
 
Description Thyristor-based harware DC/DC converter has been demonstarted with following properties:

- DC/DC voltage stepping,

- Controllable DC power flow,

- DC fault isolation,



An IGBT-based DC converter has been developed and modeled on simulator with the follwing properties:

- DC/DC voltage stepping,

- Controllable DC power flow,

- DC fault isolation,



A DC-fault tolerant VSC AC/DC converter has been developed. This converter is simple and inexpesive and yet suitable for high power applications.
Exploitation Route New DC/DC converters and VSC AC/DC converters. Converter models and control methods. DC grid building principles.
Sectors Energy

URL http://www.abdn.ac.uk/~eng727/powersystems.html
 
Description Secondment at Partner organisation 
Organisation Ryerson University
Country Canada 
Sector Academic/University 
PI Contribution Collaboration on the project research
Collaborator Contribution Collaboration on the project research
Impact three joint articles
Start Year 2010
 
Title 30kW, 200/900V DC/DC converter prototype 
Description A thyristor-based 30kW bidirectional DC/DC converter has been developed and tested. This converter works as a DC transformer, DC power flow regulator and DC circuit breaker. 
Type Of Technology Physical Model/Kit 
 
Title DC grid hardware model 
Description A DC grid model has been developed. The grid consists of 4 large converters: - 30kW, 200V, VSC AC/DC converter, - 30kW, 200V, LCC, AC/DC converter, - 30kW, 900V, VSC converter, - 30kW, 200/900V, DC/DC converter 
Type Of Technology Physical Model/Kit